如何加载内联DTD以与XDocument一起使用? [英] How to load an inline DTD for use with XDocument?

问题描述

我有一个问题，关于如何在WP7中将文档类型定义包含在XML文件中，或从XML文件包含到XML文档中.我有与此类似的DTD文件:

I have a question regarding how to include a document type definition into an XML file, or from and XML file, that is being loaded into XDocument, in WP7. I have DTD file that is similar to this:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE root [
 <!ELEMENT root (Person*)>

 <!ELEMENT Person (Name*, Description*)>
 <!ELEMENT Name (#PCDATA)>
 <!ELEMENT Description (#PCDATA)>

 <!ENTITY egrave "&#232;">
 <!ENTITY eacute "&#233;">
 <!ENTITY euro  "&#8364;">
]>

我需要将此DTD添加到XML中，以便捕获特殊字符，例如é. 我正在使用以下方法从网上获取XML以在Linq中使用:

I need to add this DTD to the XML I'm getting to catch special characters, such as é. I am getting the XML from the web to use in Linq using the following method:

private void PhoneApplicationPage_Loaded(object sender, RoutedEventArgs e)
{
  string documentUrl = "http://www.example.com";

  WebClient client = new WebClient();

  client.OpenReadCompleted += new OpenReadCompletedEventHandler(client_OpenReadCompleted);
  client.OpenReadAsync(new Uri(documentUrl, UriKind.Absolute));
}

void client_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
  Stream str = e.Result;

  XDocument data = XDocument.Load(str);

  // Saving the XML to the file system for later use
  IsolatedStorageFile isoFile = IsolatedStorageFile.GetUserStoreForApplication();
  IsolatedStorageFileStream isoStream = new IsolatedStorageFileStream("my.xml", FileMode.OpenOrCreate, isoFile);
  StreamWriter sw = new StreamWriter(isoStream);
  XmlWriter xw = XmlWriter.Create(isoStream);

  data.Save(xw);

  // Creating a list to populate a listbox
  List<MyObject> list1 = new List<MyObject>();

  items = (from query in data.Descendants("Person")
    select new MyObject()
    {
    // Doing stuff here...
    }).ToList();

  listBox1.ItemsSource = items;

}

如果将DTD内联(即在实际XML本身中)，则XDocument似乎不会传递XML. 我已经尝试过基于

It seems that XDocument won't pass the XML if the DTD is put inline, i.e. in the actual XML itself. I've tried many ways of using XDocumentType based on this post, but I can't figure it out. How can I do this?

推荐答案

读取XML文档时，需要启用DTD处理.为此，请使用具有适当设置的 XmlReader :

You need to enable DTD processing when you read the XML document. To do that use a XmlReader with appropriate settings:

var settings = new XmlReaderSettings { DtdProcessing = DtdProcessing.Parse };
XmlReader reader = XmlReader.Create(str, settings);
XDocument data = XDocument.Load(reader);

如果要外部使用DTD，则需要指定 XmlResolver 的设置:

If you want to have the DTD external you need to specify a XmlResolver in the settings:

var settings = new XmlReaderSettings
{
    DtdProcessing = DtdProcessing.Parse,
    XmlResolver = /* some resolver here */,
};

默认XmlResolver是 XmlUrlResolver 无需使用凭据即可解析URL.您可能需要考虑从本地来源解析DTD.为此，您可以使用预先填充的 XmlPreloadedResolver .

The default XmlResolver is an XmlUrlResolver which resolves URLs without using credentials. You may want to consider resolving the DTD from a local source instead. For that you can use a prepopulated XmlPreloadedResolver.

这篇关于如何加载内联DTD以与XDocument一起使用?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！